<!DOCTYPE html>
<html lang="zh-cn">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>javascript 阶段</title>
    <style>
        body {
            font-size: 30px;
        }
    </style>
</head>
<body>
    <span>行内标签1</span>  <br>
    <strong>行内标签2</strong> <br>
    <em>行内标签3</em> <br>  
    <!-- font-style: italic; 斜体字 -->
    <i>行内标签4</i>

    <!-- 行内标签的作用：修饰页面细节（文本，字体，颜色，小图标） -->
</body>
</html>